Process for isolating pure diketene with recovery of materials of value

US5370774A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Gerhard Kuenstle · Burghausen, DE
• Alois Maier · Waldkraiburg, DE

Key dates

• Filing date: Nov 3, 1993
• Grant date: Dec 6, 1994
• Expiry date: Nov 3, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/90
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for isolating pure diketene with recovery of materials of value by continuous, two-stage distillation of crude diketene at reduced pressure and with continuous reaction of the resulting distillation residue with acetic acid, pure diketene and acetic anhydride being separated off by means of the two-stage distillation. In the stabilization of the distillation residue with acetic acid, reutilizable acetic acid, which contains acetone with or without acetic anhydride, is recovered.